On Wed, 16 Apr 2014 07:48:53 +0000, Holger Hoffstätte wrote:
> On Wed, 16 Apr 2014 06:41:44 +0000, Duncan wrote:
>
>> Using btrfs-progs v3.14:
>>
>> mkfs.btrfs ... --features ...
>>
>> segfaults.
>
> Can reproduce (also with glibc 2.19 on Gentoo ;-) and building with debug
> found:
>
> (gdb) bt
> #0 0x00007ffff6f3aaea in strlen () from /lib64/libc.so.6
> #1 0x00007ffff6f3a82e in strdup () from /lib64/libc.so.6
> #2 0x00000000004213e8 in main (ac=2, av=0x7fffffffe308) at mkfs.c:1312
>
> Sure enough that line is handling 'O', where '--features' is supposed to
> be handled. No idea why -O works, but debugging shows that optarg is null
> at that point, so strdup goes poof.
Well, duh! The long_options array does not declare that --features wants
an argument, so getopt does not create one.
holger>diff -u mkfs.c\~ mkfs.c
--- mkfs.c~ 2014-04-16 09:41:42.000000000 +0200
+++ mkfs.c 2014-04-16 09:51:45.408854096 +0200
@@ -350,7 +350,7 @@
{ "version", 0, NULL, 'V' },
{ "rootdir", 1, NULL, 'r' },
{ "nodiscard", 0, NULL, 'K' },
- { "features", 0, NULL, 'O' },
+ { "features", 1, NULL, 'O' },
{ NULL, 0, NULL, 0}
};
This fixes it.
-h
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